“The White House needs to take us seriously, and if they don’t, we are going to make sure they take us seriously,” Engel told the Post. “I’m going to give them the benefit of the doubt. … But if not, I intend to use every prerogative that I have to ensure oversight."

He added that there "has been a concern" about the motivations of the administration's foreign policies in certain countries and how they relate to Trump's personal interests.

“It’s a valid topic for us to look into,” Engel said. “There has been a concern about the motivations of the administration in terms of policies in different countries, and is it connected to Trump’s business interests.”

Engel also told the newspaper that the committee will investigate links between Trump and Russia, including the president's relationship with Russian President Vladimir Putin. He said he wants to learn more details of Trump's meeting with Putin in Helsinki earlier this year.

“We still don’t know what happened in Helsinki between Trump and Putin. It’s ludicrous that months later, we still don’t know,” he told the Post. “I want to find out.”

The congressman from New York added that Pompeo "needs to respect the Foreign Affairs Committee" and cooperate with Congress in its oversight role.

“Respect is a two-way street,” Engel told the newspaper. “I won’t stand for delay and non-responsiveness to things that are clearly in our jurisdiction.”